Evaporating apparatus



(No Model.)

J. STUART. EVAPORATING APPARATUS.

No. 289,785. Patented Dec. 4, 1883.

WITNESSES a6 .dftorney UNITE STATES JOHN STUART, OF TRAER, IOXVA.

EVAPORATING APPA RATUS.

SPECIFICATION forming part of Letters Patent No.

289,785, dated December4, 1883.

Application filed October 17, 1883. (No model.)

To all whom it may concern Be it known that I, JOHN STUART, a citizen of the United States of America, residing at Traer, in the county of Tama and State of Iowa, have invented certain new and useful Improvements in Evaporating Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

This invention relates to an apparatus or a novel means employed in the evaporation of saccharine solution by which direct heat, steam heat, or hot air, in the presence of the atmosphere, is employed as an evaporating agent.

The main objects of this invention are to hasten the evaporation, to force currents of air through the solution, to prevent the saccharine solution from attaining a high tempera ture, to prevent the scorching of the solution, and to obtain greater crystallizable powers of the sugar.

My improvement consists in the combination, with an evaporating-pan of the Jamaica or open-pan class, of a reel provided with a plurality of concave blades for the purpose of forcing currents of air through the solution and agitating the same.

My improvement further consists in the novel construction and'combination of parts, as will be hereinafter fully set forth.

In the annexed drawings, which show one practical way of carrying out my invention, Figure 1 represents a transverse section of a furnace and an open pan with my improvements applied thereto, and Fig. 2 representsa perspective view of an open pan and a revolving reel embodying my improvements.

In the accompanying drawings, A represents an open pan, made of copper or other suitable material, set in brick-work, substantially as seen in Fig. l of the drawings. In this example the furnace is placed under the pan, and is heated by the direct heat or it may be heated by means of steam or hot-air pipes suitably arranged within or around the pan. Preference, however, is given either to the steam or hot air as the heating agents to be employed. To the ends of the pan are suitably formed or secured journal-bearings, to receive and support the ends of the shaft 0, passed longitudinally through the pan. This shaft 0 is provided with two or more arms, D, at or near each end within the pan. To the outer ends of these arms are blades 6, preferable shaped concave-convex, so as to present the concave portion downward, substantially as shown. These blades are perforated, as indicated by a, for the purpose hereinafter stated. To one end of the shaft 0 is con nected a crank-pulley or gear to receive the necessary power to operate the reel.

Operation: The cane-juice, after leaving the defecator, is conducted to the pan A and the proper heat for evaporation turned on. By the application of power to the shaft the reelblades are forced through the cane-j uice in the direction as indicated by the arrow. In the rotation of the reel, air is collected within the formed chambers of the blades and forced into and through the cane-j nice, the latter forcing the air through the perforations in the blades.

The air, becoming heated, expands and absorbs the moisture in the juice, and as the blades continue to revolve an agitation of the juice is caused 5 also, as the blades come to the surface, a portion of the juice is carried upward by them, which is afterward poured out and strained through the perforations in the blades,

thus subjecting it to the air and a purification. By this means I am enabled to get a circulation of air through the cane-juice, and at the same time an agitation of the same, which causes a rapid evaporation at a low temperature; and as a resultant product I am enabled to produce an article in which the crystals of sugar are large and more numerous than if treated by the ordinary evaporators. The heat having been cut off, the cooling of the canejuice takes place, and the crystallization of the sugar is insured. The resultant product of this apparatus is now transferred to the granulating-room, and aftera proper treatment here it is ready for the centrifugal machine.

I reserve the right to apply the reel containing my improvements to all classes of open evaporating-pans used in the sugar industry.

"What I claim as my invention, and desire to having perforations, substantially as de- 10 secure by Letters Patent, is- I scribed, and for thepurpose set forth.

1. As an attachment to an evaporating-pan, In testimony whereof I affix my signature in the reel consisting of the shaft 0, the end arms, presence of two Witnesses. 5 D, and the perforated concave blades 6,- as set JOHN STUART forth.

2. In an evaporating apparatus, the com- Witnesses: bination, with an open pan, of arevolving \VM. H. BATES,

reel provided with two or more concave blades H. A. HALL. 

